<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>while实现1到100相加求和</title>
</head>

<body>
    <script>
        var sum = 0;
        var a = 1;
        while (a <= 100) {
            sum = sum + a;
            a = a + 1;
        }
        alert("1-100的数相加的和是" + sum);
    </script>
</body>

</html>